Evaluation of effects of sustained decadal precipitation manipulations on soil carbon stocks

Mats Fröberg; Paul J. Hanson; Donald E. Todd; Dale W. Johnson

doi:10.1007/s10533-008-9205-8

Evaluation of effects of sustained decadal precipitation manipulations on soil carbon stocks

Mats Fröberg, Paul J. Hanson, Donald E. Todd, Dale W. Johnson

Environmental Sciences Division

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Throughout a 13 year period, the Throughfall Displacement Experiment sustained both increased (+33; wet) and decreased (-33%; dry) throughfall into an upland oak forest in Tennessee. Organic (O) horizon carbon (C) stocks were measured at several occasions before, during and after the experiment and mineral soil C stocks before and after the experiment. In the O horizon, higher C stocks were observed in the dry treatment compared to the ambient and wet, attributable to a combination of enhanced litter inputs and reduced decomposition. No precipitation treatment effects on mineral soil C stocks were found to a depth of 60 cm. Conversely, long-term reductions in surface mineral soil C stocks were surprisingly high for all treatments (3.5-2.7% C in the 0-15 cm layer and from 0.6 to 0.5% in the 15-30 cm layer) over the duration of the experiment. A clear explanation for this temporal trend in C storage was not readily apparent.

Original language	English
Pages (from-to)	151-161
Number of pages	11
Journal	Biogeochemistry
Volume	89
Issue number	2
DOIs	https://doi.org/10.1007/s10533-008-9205-8
State	Published - Jun 2008

Funding

Acknowledgements We acknowledge support from the U.S. Department of Energy (DOE), OYce of Science, Biological and Environmental Research (BER) program as part of the Program for Ecosystem Research (PER). Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for the DOE under contract DE-AC05-00OR22725.

Funders	Funder number
OYce of Science
U.S. Department of Energy
Biological and Environmental Research
Oak Ridge National Laboratory	DE-AC05-00OR22725

Keywords

Forest soils
Precipitation
Soil organic carbon

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10.1007/s10533-008-9205-8

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abstract = "Throughout a 13 year period, the Throughfall Displacement Experiment sustained both increased (+33; wet) and decreased (-33%; dry) throughfall into an upland oak forest in Tennessee. Organic (O) horizon carbon (C) stocks were measured at several occasions before, during and after the experiment and mineral soil C stocks before and after the experiment. In the O horizon, higher C stocks were observed in the dry treatment compared to the ambient and wet, attributable to a combination of enhanced litter inputs and reduced decomposition. No precipitation treatment effects on mineral soil C stocks were found to a depth of 60 cm. Conversely, long-term reductions in surface mineral soil C stocks were surprisingly high for all treatments (3.5-2.7% C in the 0-15 cm layer and from 0.6 to 0.5% in the 15-30 cm layer) over the duration of the experiment. A clear explanation for this temporal trend in C storage was not readily apparent.",

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AU - Hanson, Paul J.

AU - Todd, Donald E.

AU - Johnson, Dale W.

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AB - Throughout a 13 year period, the Throughfall Displacement Experiment sustained both increased (+33; wet) and decreased (-33%; dry) throughfall into an upland oak forest in Tennessee. Organic (O) horizon carbon (C) stocks were measured at several occasions before, during and after the experiment and mineral soil C stocks before and after the experiment. In the O horizon, higher C stocks were observed in the dry treatment compared to the ambient and wet, attributable to a combination of enhanced litter inputs and reduced decomposition. No precipitation treatment effects on mineral soil C stocks were found to a depth of 60 cm. Conversely, long-term reductions in surface mineral soil C stocks were surprisingly high for all treatments (3.5-2.7% C in the 0-15 cm layer and from 0.6 to 0.5% in the 15-30 cm layer) over the duration of the experiment. A clear explanation for this temporal trend in C storage was not readily apparent.

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Evaluation of effects of sustained decadal precipitation manipulations on soil carbon stocks

Abstract

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Keywords

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